////////////////////////////////////////////////////////////////////////
//
// Copyright (C) 2013-2022 The Octave Project Developers
//
// See the file COPYRIGHT.md in the top-level directory of this
// distribution or <https://octave.org/copyright/>.
//
// This file is part of Octave.
//
// Octave is free software: you can redistribute it and/or modify it
// under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Octave is distributed in the hope that it will be useful, but
// WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Octave; see the file COPYING.  If not, see
// <https://www.gnu.org/licenses/>.
//
////////////////////////////////////////////////////////////////////////

#if defined (HAVE_CONFIG_H)
#  include "config.h"
#endif

#include <QCheckBox>
#include <QComboBox>
#include <QDialogButtonBox>
#include <QDirIterator>
#include <QFileDialog>
#include <QFileInfo>
#include <QGridLayout>
#include <QGroupBox>
#include <QHeaderView>
#include <QIcon>
#include <QLabel>
#include <QLineEdit>
#include <QPushButton>
#include <QStatusBar>
#include <QTableView>
#include <QTextStream>
#include <QTimer>

#include "find-files-dialog.h"
#include "find-files-model.h"
#include "gui-preferences-global.h"
#include "gui-preferences-ff.h"
#include "octave-qobject.h"

OCTAVE_BEGIN_NAMESPACE(octave)

find_files_dialog::find_files_dialog (QWidget *p, base_qobject& oct_qobj)
: QDialog (p), m_octave_qobj (oct_qobj)
{
  resource_manager& rmgr = m_octave_qobj.get_resource_manager ();

  setWindowTitle (tr ("Find Files"));
  setWindowIcon (rmgr.icon ("edit-find"));

  m_dir_iterator = nullptr;

  m_timer = new QTimer (this);
  connect (m_timer, &QTimer::timeout,
           this, &find_files_dialog::look_for_files);

  gui_settings *settings = rmgr.get_settings ();

  QLabel *file_name_label = new QLabel (tr ("Named:"));
  m_file_name_edit = new QLineEdit;
  m_file_name_edit->setToolTip (tr ("Enter the filename search expression"));

  m_file_name_edit->setText (settings->value (ff_file_name).toString ());
  file_name_label->setBuddy (m_file_name_edit);

  QLabel *start_dir_label = new QLabel (tr ("Start in:"));

  m_start_dir_edit = new QLineEdit;
  m_start_dir_edit->setText (settings->value (ff_start_dir.key,
                                              QDir::currentPath ()).toString ());
  m_start_dir_edit->setToolTip (tr ("Enter the start directory"));
  start_dir_label->setBuddy (m_start_dir_edit);

  m_browse_button = new QPushButton (tr ("Browse..."));
  m_browse_button->setToolTip (tr ("Browse for start directory"));
  connect (m_browse_button, &QPushButton::clicked,
           this, &find_files_dialog::browse_folders);

  m_recurse_dirs_check = new QCheckBox (tr ("Search subdirectories"));
  m_recurse_dirs_check->setChecked (settings->value (ff_recurse_dirs).toBool ());
  m_recurse_dirs_check->setToolTip (tr ("Search recursively through directories for matching files"));

  m_include_dirs_check = new QCheckBox (tr ("Include directory names"));
  m_include_dirs_check->setChecked (settings->value (ff_include_dirs).toBool ());
  m_include_dirs_check->setToolTip (tr ("Include matching directories in search results"));

  m_name_case_check = new QCheckBox (tr ("Name case insensitive"));
  m_name_case_check->setChecked (settings->value (ff_name_case).toBool ());
  m_name_case_check->setToolTip (tr ("Set matching name is case insensitive"));

  m_contains_text_check = new QCheckBox (tr ("Contains text:"));
  m_contains_text_check->setToolTip (tr ("Enter the file content search expression"));
  m_contains_text_check->setChecked (settings->value (ff_check_text).toBool ());

  m_contains_text_edit = new QLineEdit ();
  m_contains_text_edit->setToolTip (tr ("Text to match"));
  m_contains_text_edit->setText (settings->value (ff_contains_text).toString ());

  m_content_case_check = new QCheckBox (tr ("Text case insensitive"));
  m_content_case_check->setChecked (settings->value (ff_content_case).toBool ());
  m_content_case_check->setToolTip (tr ("Set text content is case insensitive"));

  find_files_model *model = new find_files_model (this);

  m_file_list = new QTableView;
  m_file_list->setWordWrap (false);
  m_file_list->setModel (model);
  m_file_list->setShowGrid (false);
  m_file_list->setSelectionBehavior (QAbstractItemView::SelectRows);
  m_file_list->setSelectionMode (QAbstractItemView::SingleSelection);
  m_file_list->setAlternatingRowColors (true);
  m_file_list->setToolTip (tr ("Search results"));
  m_file_list->setSortingEnabled (true);
  m_file_list->horizontalHeader ()->restoreState (settings->value (ff_column_state.key).toByteArray ());
  m_file_list->horizontalHeader ()->setSortIndicatorShown (true);
  m_file_list->horizontalHeader ()->setSectionsClickable (true);
  m_file_list->horizontalHeader ()->setStretchLastSection (true);
  m_file_list->sortByColumn (settings->value (ff_sort_files_by_column).toInt (),
                             static_cast<Qt::SortOrder>
                             (settings->value (ff_sort_files_by_order).toUInt ()));
  // FIXME: use value<Qt::SortOrder> instead of static cast after
  //        dropping support of Qt 5.4

  connect (m_file_list, &QTableView::doubleClicked,
           this, &find_files_dialog::item_double_clicked);

  m_status_bar = new QStatusBar;
  m_status_bar->showMessage (tr ("Idle."));

  m_find_button = new QPushButton (tr ("Find"));
  m_find_button->setToolTip (tr ("Start search for matching files"));
  connect (m_find_button, &QPushButton::clicked,
           this, &find_files_dialog::start_find);

  m_stop_button = new QPushButton (tr ("Stop"));
  m_stop_button->setToolTip (tr ("Stop searching"));
  m_stop_button->setEnabled (false);
  connect (m_stop_button, &QPushButton::clicked,
           this, &find_files_dialog::stop_find);

  // layout everything
  QDialogButtonBox *button_box = new QDialogButtonBox (Qt::Vertical);
  button_box->addButton (m_find_button, QDialogButtonBox::ActionRole);
  button_box->addButton (m_stop_button, QDialogButtonBox::ActionRole);

  // add dialog close button
  m_close_button = button_box->addButton (QDialogButtonBox::Close);
  connect (button_box, &QDialogButtonBox::rejected,
           this, &find_files_dialog::close);

  // name options
  QGroupBox *name_group = new QGroupBox (tr ("Filename/location"));
  QGridLayout *name_layout = new QGridLayout;
  name_group->setLayout (name_layout);

  name_layout->addWidget (file_name_label, 1, 1, 1, 1);
  name_layout->addWidget (m_file_name_edit, 1, 2, 1, -1);

  name_layout->addWidget (start_dir_label, 2, 1);
  name_layout->addWidget (m_start_dir_edit, 2, 2, 1, 3);
  name_layout->addWidget (m_browse_button, 2, 5);
  name_layout->setColumnStretch (2, 1);

  name_layout->addWidget (m_recurse_dirs_check, 3, 1);
  name_layout->addWidget (m_include_dirs_check, 3, 2);
  name_layout->addWidget (m_name_case_check, 3, 3);

  // content options
  QGroupBox *content_group = new QGroupBox (tr ("File contents"));
  QGridLayout *content_layout = new QGridLayout;
  content_group->setLayout (content_layout);
  content_layout->addWidget (m_contains_text_check, 4, 1);
  content_layout->addWidget (m_contains_text_edit, 4, 2, 1, 3);
  content_layout->setColumnStretch (2, 1);
  content_layout->addWidget (m_content_case_check, 5, 1);

  QGridLayout *main_layout = new QGridLayout;
  main_layout->setSizeConstraint (QLayout::SetFixedSize);
  main_layout->addWidget (name_group, 0, 0);
  main_layout->addWidget (content_group, 1, 0);
  main_layout->addWidget (button_box, 0, 1, 3, 1);
  main_layout->addWidget (m_file_list, 2, 0);
  main_layout->setRowStretch (2, 1);
  main_layout->addWidget (m_status_bar, 3, 0, 1, -1);

  setLayout (main_layout);

  connect (this, &find_files_dialog::finished,
           this, &find_files_dialog::handle_done);
}

find_files_dialog::~find_files_dialog (void)
{
  delete m_dir_iterator;
}

void find_files_dialog::save_settings (void)
{
  resource_manager& rmgr = m_octave_qobj.get_resource_manager ();
  gui_settings *settings = rmgr.get_settings ();

  if (! settings)
    return;

  int sort_column = m_file_list->horizontalHeader ()->sortIndicatorSection ();
  Qt::SortOrder sort_order
    = m_file_list->horizontalHeader ()->sortIndicatorOrder ();
  settings->setValue (ff_sort_files_by_column.key, sort_column);
  settings->setValue (ff_sort_files_by_order.key, sort_order);
  settings->setValue (ff_column_state.key, m_file_list->horizontalHeader ()->saveState ());

  settings->setValue (ff_file_name.key, m_file_name_edit->text ());

  settings->setValue (ff_start_dir.key, m_start_dir_edit->text ());

  settings->setValue (ff_recurse_dirs.key, m_recurse_dirs_check->text ());
  settings->setValue (ff_include_dirs.key, m_include_dirs_check->text ());
  settings->setValue (ff_name_case.key, m_name_case_check->text ());

  settings->setValue (ff_contains_text.key, m_contains_text_edit->text ());
  settings->setValue (ff_check_text.key, m_contains_text_check->isChecked ());
  settings->setValue (ff_content_case.key, m_content_case_check->isChecked ());

  settings->sync ();
}

void find_files_dialog::set_search_dir (const QString& dir)
{
  stop_find ();
  m_start_dir_edit->setText (dir);
}

void find_files_dialog::start_find (void)
{
  stop_find ();

  find_files_model *m = static_cast<find_files_model *> (m_file_list->model ());
  m->clear ();

  QDirIterator::IteratorFlags flags = QDirIterator::NoIteratorFlags;
  if (m_recurse_dirs_check->isChecked ())
    flags |= QDirIterator::Subdirectories;

  QDir::Filters filters = QDir::Dirs | QDir::NoDotAndDotDot | QDir::Files;
  if (! m_name_case_check->isChecked ())
    filters |= QDir::CaseSensitive;

  QStringList nameFilters;
  nameFilters.append (m_file_name_edit->text ());

  if (m_dir_iterator)
    delete m_dir_iterator;

  m_dir_iterator = new QDirIterator (m_start_dir_edit->text (), nameFilters,
                                     filters, flags);

  // enable/disable widgets
  m_find_button->setEnabled (false);
  m_stop_button->setEnabled (true);
  m_close_button->setEnabled (false);
  m_browse_button->setEnabled (false);
  m_start_dir_edit->setEnabled (false);
  m_file_name_edit->setEnabled (false);
  m_recurse_dirs_check->setEnabled (false);
  m_include_dirs_check->setEnabled (false);
  m_name_case_check->setEnabled (false);
  m_contains_text_check->setEnabled (false);
  m_content_case_check->setEnabled (false);
  m_contains_text_edit->setEnabled (false);

  m_status_bar->showMessage (tr ("Searching..."));
  m_timer->start (0);
}

void find_files_dialog::stop_find (void)
{
  m_timer->stop ();

  m_find_button->setEnabled (true);
  m_stop_button->setEnabled (false);
  m_close_button->setEnabled (true);
  m_browse_button->setEnabled (true);
  m_start_dir_edit->setEnabled (true);
  m_file_name_edit->setEnabled (true);
  m_recurse_dirs_check->setEnabled (true);
  m_include_dirs_check->setEnabled (true);
  m_name_case_check->setEnabled (true);
  m_contains_text_check->setEnabled (true);
  m_content_case_check->setEnabled (true);
  m_contains_text_edit->setEnabled (true);

  find_files_model *m = static_cast<find_files_model *> (m_file_list->model ());
  QString res_str = QString (tr ("%1 match (es)")).arg (m->rowCount ());

  m_status_bar->showMessage (res_str);
}

void find_files_dialog::browse_folders (void)
{
  int opts = 0;  // No options by default.
  // FIXME: Remove, if for all common KDE versions (bug #54607) is resolved.
  resource_manager& rmgr = m_octave_qobj.get_resource_manager ();
  gui_settings *settings = rmgr.get_settings ();
  if (! settings->value (global_use_native_dialogs).toBool ())
    opts = QFileDialog::DontUseNativeDialog;

  QString dir =
    QFileDialog::getExistingDirectory (this, tr ("Set search directory"),
                                       m_start_dir_edit->text (),
                                       QFileDialog::Option (opts));

  if (! dir.isEmpty ())
    m_start_dir_edit->setText (dir);
}

void find_files_dialog::item_double_clicked (const QModelIndex& idx)
{
  find_files_model *m = static_cast<find_files_model *> (m_file_list->model ());

  QFileInfo info = m->fileInfo (idx);

  if (idx.column () == 1)
    {
      // clicked in directory part
      emit dir_selected (info.absolutePath ());
    }
  else
    {
      // clicked in filename part
      if (info.isDir ())
        emit dir_selected (info.absoluteFilePath ());
      else
        emit file_selected (info.absoluteFilePath ());
    }
}

void find_files_dialog::look_for_files (void)
{
  if (m_dir_iterator && m_dir_iterator->hasNext ())
    {
      QFileInfo info (m_dir_iterator->next ());

      find_files_model *m
        = static_cast<find_files_model *> (m_file_list->model ());

      if (is_match (info))
        m->addFile (info);
    }
  else
    {
      stop_find ();
    }
}

void find_files_dialog::handle_done (int)
{
  // make sure we stopped processing
  stop_find ();
}

bool find_files_dialog::is_match (const QFileInfo& info)
{
  bool match = true;
  if (info.isDir ())
    {
      if (! m_include_dirs_check->isChecked ()) match = false;
      if (m_contains_text_check->isChecked ()) match = false;
    }
  else
    {
      // a file
      if (m_contains_text_check->isChecked ())
        {
          match = false;

          QFile file (info.absoluteFilePath ());
          if (file.open (QIODevice::ReadOnly))
            {
              QTextStream stream (&file);

              QString line;
              QString match_str = m_contains_text_edit->text ();

              Qt::CaseSensitivity cs = m_content_case_check->isChecked ()
                ? Qt::CaseInsensitive
                : Qt::CaseSensitive;

              do
                {
                  line = stream.readLine ();
                  match = line.contains (match_str, cs);
                }
              while (! line.isNull () && match == false);
            }

        }
    }

  return match;
}

OCTAVE_END_NAMESPACE(octave)